11, it hard to explain but it right the pattern is +4 then -3, +5 then -2, add +6 then -1, which would get to 11
The Number Which Best Completes The Sequence Below Is? 2 6 3 8 6 12?
The second differences of the given series alternate -7, 8, -7, 8. If the series continues in that way, it looks like
2, 6, 3, 8, 6, 12, 11, 18, 18, 26, 27, 36
The number 11 is next in the series.
First differences are
4, -3, 5, -2, 6
They would continue as
4, -3, 5, -2, 6, -1, 7, 0, 8, 1, 9
Effectively, the series can be considered as two interleaved quadratic series.
2, 6, 3, 8, 6, 12, 11, 18, 18, 26, 27, 36
The number 11 is next in the series.
First differences are
4, -3, 5, -2, 6
They would continue as
4, -3, 5, -2, 6, -1, 7, 0, 8, 1, 9
Effectively, the series can be considered as two interleaved quadratic series.
The number which best completes the sequence below is:
2 6 3 8 6 12
2 6 3 8 6 12